Matches operations with two numbers separated by the operational characters (x, -, ÷, %) ** the numbers can be negative** (can contain a - character before the number).

It also acepts decimal notation with not zero (0). Example: 0.89 and .89 are both accepted values

Acepted values example:

• -3x+5.0
• 784.5-.56
• 1÷.5